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MULTIPLE STYLI ANNOTATION SYSTEM

  • US 20080169132A1
  • Filed: 12/31/2007
  • Published: 07/17/2008
  • Est. Priority Date: 01/03/2007
  • Status: Abandoned Application
First Claim
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1. An apparatus comprising:

  • a surface;

    one or more receiver subsystems each placed at a respective set of selected locations relative to the surface, the selected locations being to define a working area on the surface, each receiver subsystem including;

    an electromagnetic signal sensor operative to receive electromagnet signals from one or more styli when the one or more styli are operating in the working area, each stylus including a stylus tip, a power source, a transmitter of ultrasound energy, at least one transmitter of electromagnetic signals, and a receiver of electromagnetic signals,an electromagnetic energy signal transmitter operative to send electromagnet signals to one or more styli when the one or more styli are operating in the working area,at least one ultrasound signal sensor operative to receive ultrasound signals from the one or more styli when the one or more styli are operating in the working area,wherein in the case the receiver subsystem includes at least two ultrasound signal sensors and the apparatus is operative with only one receiver subsystem, two or more of the signal sensors of the receiver subsystem have a pre-defined or a determinable spatial relationship to each other,wherein in the case the receiver subsystem includes only one ultrasound signal sensor, the apparatus includes two or more the receiver subsystems whose respective ultrasound signal sensors have a pre-defined or a determinable spatial relationship to each other; and

    at least one controller coupled to the one or more receiver subsystems and operative in combination with the one or more receiver subsystems to cause coordination of the transmitting by the styli, and operative in combination with the one or more receiver subsystems to determine the location of the one or more styli in the working area when the one or more styli are operating in the working area, such that more than one stylus can operate at the same time in the working area.

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